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Related Experiment Videos

Enkephalins and nigrostriatal function.

B I Diamond, R L Borison

    Neurology
    |November 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Enkephalinergic neurons modulate dopamine pathways. Blocking enkephalin receptors enhanced dopamine drugs, while increasing enkephalin reversed effects, suggesting distinct pre- and postsynaptic roles in nigrostriatal function.

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    Area of Science:

    • Neuroscience
    • Pharmacology

    Background:

    • Parkinsonism is linked to dopamine deficiency in the nigrostriatal pathway.
    • Enkephalins are endogenous opioid peptides with complex roles in neurotransmission.

    Purpose of the Study:

    • To investigate the role of enkephalinergic neurons in modulating nigrostriatal dopaminergic function.
    • To explore the differential effects of pre- and postsynaptic enkephalinergic modulation on dopamine pathways.

    Main Methods:

    • Unilateral substantia nigra lesions were induced using 6-hydroxydopamine in a rat model.
    • The effects of enkephalin receptor antagonists (naloxone) and enkephalin-increasing agents (d-phenylalanine, methionine-enkephalin) were assessed.
    • Reserpine-induced parkinsonism was used to evaluate naloxone's effects.

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    Main Results:

    • Naloxone potentiated postsynaptic dopaminergic agents but antagonized presynaptic ones.
    • Agents increasing enkephalin content showed opposite effects, antagonizing postsynaptic and potentiating presynaptic agents.
    • Naloxone reversed reserpine-induced parkinsonism.

    Conclusions:

    • Evidence suggests the existence of separate pre- and postsynaptic enkephalinergic neurons.
    • These distinct neuronal populations appear to differentially modulate nigrostriatal dopaminergic function.
    • Enkephalins may play a significant role in regulating dopamine-related motor control and potentially in Parkinsonism.